JP6365684B2 - Electromagnetic relay - Google Patents

Description

  The present invention relates to an electromagnetic relay, and more particularly, to an electromagnetic relay that can efficiently erase generated arcs.

  2. Description of the Related Art Conventionally, as an electromagnetic relay, for example, an armature that swings when an electromagnet block is excited and de-excited, and a movable contact, which is attached to the armature and swings as the armature swings are movable. An electromagnetic relay comprising a contact portion and a fixed contact portion having a fixed contact with which the movable contact contacts and separates, wherein the electromagnetic relay has an arc generated when the movable contact and the fixed contact are contacted and separated And an electromagnetic field generating means for guiding an arc generated when the movable contact and the fixed contact come into contact with or separated from the arc extension space. A relay is disclosed (see Patent Document 1).

  In the electromagnetic relay, as shown in FIG. 7, a fixed contact 22a is arranged on the upper surface edge of the base 30, and a movable contact 21a is arranged inside the fixed contact 22a. In the electromagnetic relay, the arc generated between the movable contact 21a and the fixed contact 22a is attracted upward by the magnetic force of the permanent magnet 50, and the arc is stretched longer, thereby eliminating the arc. Yes.

JP2013-80692A

However, in the above-described electromagnetic relay, permanent magnets are respectively disposed between adjacent fixed contacts in order to extend the arc upward. For this reason, there exists a problem that the width dimension (direction where a fixed contact adjoins) of an electromagnetic relay becomes large.
In addition, since the arc needs to be stretched high upward, it is necessary to dispose a tall permanent magnet, which hinders a reduction in the height of the electromagnetic relay.
The electromagnetic relay which concerns on this invention makes it a subject to provide the small electromagnetic relay with a small width dimension and a short height in view of the said problem.

In order to solve the above-described problems, an electromagnetic relay according to the present invention includes a base, an electromagnet block installed on an upper surface of the base, a movable iron piece that rotates based on excitation / non-excitation of the electromagnet block, A movable contact piece that rotates integrally with the movable iron piece, a movable contact that is fixed to a free end of the movable contact piece, and a movable contact piece that is disposed so as to contact and separate from the movable contact as the movable contact piece rotates. A fixed contact and an arc generated between the movable contact and the fixed contact in a direction opposite to the movable contact or the fixed contact facing the fixed contact or the movable contact and the base. the are a configuration comprising a arranged magnetic field generating means so as to attract the opposite direction.

  According to the present invention, an arc generated between a movable contact and a fixed contact is attracted in a direction opposite to the movable contact or fixed contact facing the fixed contact or the movable contact and in a direction opposite to the base. Thus, the magnetic field generating means is arranged. For this reason, it is not necessary to arrange the permanent magnet in the width direction of the electromagnetic relay (the direction perpendicular to the direction in which the fixed contact and the movable contact come in contact with each other and the direction parallel to the base), and the electromagnetic having a small width dimension. A relay is obtained. In addition, the arc is attracted in the direction opposite to the movable contact or fixed contact facing the fixed contact or movable contact and in the direction opposite to the base. That is, since the arc is attracted obliquely backward as viewed from the fixed contact or the movable contact, it is not necessary to arrange a tall permanent magnet as in the conventional example, and a small electromagnetic relay with a low height can be obtained.

In an embodiment of the present invention, the movable contact piece has a substantially T shape having a wide portion at a tip, and the movable contact is fixed to a free end portion of the wide portion. May be.
According to this embodiment, since the generated arc is attracted obliquely rearward when viewed from the fixed contact or the movable contact, it is difficult to contact the movable contact piece itself, and there is an advantage that deterioration of the movable contact piece can be prevented. .

As another embodiment of the present invention, the magnetic field generating means comprises a permanent magnet and an auxiliary yoke, and the permanent magnet is disposed in a direction in which the fixed contact and the movable contact are in contact with or separated from each other. The auxiliary yoke may be adjacent.
According to this embodiment, the direction of the magnetic lines of force of the permanent magnet can be changed via the auxiliary yoke. That is, by adjusting the shape and position of the auxiliary yoke, it is possible to adjust the induction direction of the arc generated between the fixed contact and the movable contact in a desired direction. Further, by making the auxiliary yoke adjacent to the permanent magnet, the leakage of the magnetic flux of the permanent magnet is reduced and the magnetic efficiency is improved, so that the permanent magnet can be reduced in size.

As another embodiment of the present invention, an arc extinguishing space located in a direction opposite to the movable contact or the fixed contact facing the fixed contact or the movable contact is disposed on the upper surface of the base. Also good.
According to the present embodiment, the arc can be elongated in the arc extinguishing space, and the arc can be erased efficiently.

In another embodiment of the present invention, the arc extinguishing space is formed between a partition wall provided on the upper surface of the base and a terminal hole for arranging the fixed contact terminal on which the fixed contact is arranged on the base. May be.
According to this embodiment, damage to internal components can be prevented by the partition wall, so that an electromagnetic relay having a long life can be obtained.

As a new embodiment of the present invention, a metal arc interruption member may be arranged in the arc extinguishing space.
According to this embodiment, since the arc generated by the arc interrupting member is quenched and disappears, an electromagnetic relay that can erase the arc more efficiently can be obtained.

As another embodiment of the present invention, a plurality of pairs of the movable contact and the fixed contact are provided, and an arc generated between the first movable contact and the first fixed contact is the first movable contact or the first fixed contact. A first magnetic field generating means arranged to be attracted in a direction opposite to the first fixed contact or the first movable contact facing the first fixed contact and in a direction opposite to the base; Second magnetic field generating means arranged to attract the arc generated between the movable contact and the second fixed contact and the arc generated between the third movable contact and the third fixed contact in opposite directions. It is good also as a structure provided with these.
According to this embodiment, by using a plurality of permanent magnets, the generated arc can be attracted in various directions, the degree of freedom in design can be increased, dead space can be effectively used, and the electromagnetic relay can be miniaturized. .

In another embodiment of the present invention, the second movable contact and the third movable contact, and the second fixed contact and the third fixed contact are arranged adjacent to each other, and the second magnetic field generating means Attracts an arc generated between the second movable contact and the second fixed contact toward the upper surface of the base, and generates an arc between the third movable contact and the third fixed contact. It is good also as a structure arrange | positioned so that it may attract in the direction opposite to the upper surface of the said base.
According to the present embodiment, by using the magnetic force of the second permanent magnet, an arc generated between a specific movable contact and a fixed contact among a plurality of pairs of movable contact and fixed contact is attracted in a predetermined direction. In addition, the design freedom is further increased, the dead space can be effectively used, and the electromagnetic relay can be further reduced in size.

FIGS. A and B are an overall perspective view of the electromagnetic relay according to the present invention as viewed from obliquely above and an oblique view as viewed from obliquely below. FIG. A and FIG. B are an overall perspective view seen from obliquely above and an overall perspective view seen obliquely from below, with the cover removed from the electromagnetic relay according to the present invention. It is the disassembled perspective view seen from diagonally upward of the electromagnetic relay shown in FIG. FIG. 2 is an exploded perspective view of the electromagnetic relay shown in FIG. 1 as viewed obliquely from below. FIGS. A and B are cross-sectional views of the electromagnetic relay cut at different positions. FIGS. A and B are horizontal sectional views of the electromagnetic relay cut at different positions. FIGS. A and B are longitudinal sectional views of the electromagnetic relay cut at different positions. FIGS. A and B are a longitudinal sectional view and a partially enlarged longitudinal sectional view of an electromagnetic relay. FIGS. A and B are longitudinal sectional views of the electromagnetic relay after operation cut at different positions. FIGS. A and B are a plan view and a bottom view of the base. FIGS. A and B are a perspective view and a right side view showing a modified example of the auxiliary yoke, and FIGS. C and D are a perspective view and a right side view showing another modified example of the auxiliary yoke. FIGS. A and B are a perspective view and a longitudinal sectional view showing an arc interrupting member, and FIGS. C and D are a perspective view and a longitudinal sectional view showing another arc interrupting member. FIGS. A and B are a schematic plan view and a schematic front view showing the contact mechanism. FIGS. A and B are a plan view and a front view illustrating magnetic lines of force of a permanent magnet of the electromagnetic relay according to the first embodiment as vector lines. FIGS. A and B are a plan view and a front view illustrating the magnetic flux density of the permanent magnet of the electromagnetic relay according to the first embodiment in shades. FIGS. A and B are a plan view and a front view illustrating magnetic lines of force of the electromagnetic relay according to the second embodiment as vector lines. FIGS. A and B are a plan view and a front view illustrating the magnetic flux density of the permanent magnet of the electromagnetic relay according to the second embodiment in shades.

An embodiment of an electromagnetic relay according to the present invention will be described with reference to the accompanying drawings of FIGS.
As shown in FIGS. 3 and 4, the electromagnetic relay according to the present embodiment is roughly the base 10, the fixed contact terminals 21 to 24, the magnetic field generating means 35, the electromagnet block 40, the movable iron piece 60, and the movable The contact pieces 80 and 81 and the cover 90 are configured.

As shown in FIG. 10A, the base 10 has a pair of L-shaped partition walls 12 and 12 projecting from left and right sides of a recess 11 provided at the center of the upper surface thereof. The base 10 is provided with a stepped portion 13 at one of the edges facing the front and rear with the recess 11 in between, and a press-fit hole 14 at the other edge. The step 13 is for supporting a spool 41 of an electromagnet block 40 which will be described later. The press-fitting hole 14 is used to press-fit the lower end portion 57a of the yoke 55 of the electromagnet block 40. Further, the base 10 is provided with terminal holes 15a to 15d on the same straight line along one edge of the opposing edges on the upper surface, while the terminal holes 16 along the other edge. 16 is provided. Next, the base 10 has arc extinguishing spaces 19 and 19 formed between the partition walls 12 and 12 and the terminal holes 15a and 15d, respectively. The base 10 is formed with a pair of engaging claws 10a on the outer surfaces facing each other with the partition walls 12 and 12 therebetween.
According to the present embodiment, by effectively utilizing the dead space of the base 10 as the arc extinguishing space 19, there is an advantage that an increase in the size of the electromagnetic relay can be avoided.

  Further, as shown in FIG. 10B, the base 10 has a lower surface behind the terminal holes 15 a and 15 d into which the fixed contact terminals 21 and 24 are inserted (described later as viewed from the terminal holes 15 a and 15 d). And a substantially L-shaped cutout groove 17, which is a recess, is provided in the direction opposite to the installation direction of the movable contacts 86a, 87b). A part of the notch groove 17 communicates with the outside from the side surface of the base 10 and can accommodate a first permanent magnet 30 and an auxiliary yoke 31 to be described later. The base 10 has a recess 18 for accommodating a second permanent magnet 32 described later between the terminal holes 15b and 15c. The base 10 is provided with a pair of ribs 10b and 10b on the lower surface thereof so as to eliminate the inclination when the electromagnetic relay according to the present invention is surface-mounted on the substrate.

  As shown in FIG. 13, the fixed contact terminals 21 to 24 (FIGS. 3 and 4) have fixed contacts 21a to 24a fixed to their upper ends and terminal portions 21b to 24b at their lower ends. ing. Then, by inserting the terminal portions 21b to 24b into the terminal holes 15a to 15d (FIGS. 10A and 10B) of the base 10, the fixed contacts 21a to 24a are aligned on the same straight line. The reason why the four fixed contacts 21a to 24a are arranged in this way is to reduce the load voltage applied to each of the fixed contacts 21a to 24a. This is to suppress the occurrence of arcs when the DC power supply circuit is opened and closed.

  As shown in FIGS. 3 and 4, the coil terminal 25 has a connection portion 25 a bent at the upper end portion thereof, and a terminal portion 25 b at the lower end portion thereof. Then, by pressing the terminal portion 25b into the terminal hole 16 (FIGS. 10A and 10B) of the base 10, the coil terminals 25 and 25 are aligned on the same straight line.

  As shown in FIGS. 3, 4, and 13, the magnetic field generating unit 35 includes a first permanent magnet 30, an auxiliary yoke 31, and a second permanent magnet 32. Then, the first permanent magnet 30 is arranged in a direction in which the fixed contacts 21a, 24a and the movable contacts 86a, 87b are contacted and separated, that is, in a direction opposite to the movable contacts 86a, 87b when viewed from the fixed contacts 21a, 24a ( FIG. 6B). An auxiliary yoke 31 is disposed adjacent to the first permanent magnet 30 (FIG. 6B). And the 2nd permanent magnet 32 (FIG. 7B) is arrange | positioned between the stationary contact 22a and the stationary contact 23a shown to FIG. 6B.

  Further, the directions of the magnetic poles of the first permanent magnet 30 and the second permanent magnet 32 are set between the fixed contacts 21a to 24a and the movable contacts 86a, 86b, 87a and 87b when the fixed contact terminals 22 and 23 are made conductive. It is determined according to the direction of the flowing current. Therefore, the first permanent magnet 30, the auxiliary yoke 31, and the second permanent magnet 32 generate arcs generated between the fixed contacts 21a, 22a, 23a, and 24a and the movable contacts 86a, 86b, 87a, and 87b, respectively. It can be attracted in a predetermined direction, stretched and erased.

  Particularly, the auxiliary yoke 31 can change the magnetic lines of force of the first permanent magnet 30 in a desired direction by adjusting the shape and position thereof. For this reason, while being able to adjust the induction direction of an arc, the magnetic flux leakage of the said 1st permanent magnet 30 is eliminated, and it is provided in order to improve magnetic efficiency.

That is, as shown in FIGS. 6A and 6B, the first permanent magnet 30 and the auxiliary yoke 31 are configured such that the arc generated between the fixed contact 21a and the movable contact 86a is as viewed from the fixed contact 21a. Are arranged to emit magnetic field lines that can be attracted in the opposite direction.
Further, the first permanent magnet 30 and the auxiliary yoke 31 emit magnetic lines that can attract an arc generated between the fixed contact 24a and the movable contact 87b in a direction opposite to the movable contact 87b when viewed from the fixed contact 24a. So that it is arranged.

The second permanent magnet 32 is arranged so as to emit magnetic lines that can attract the arc generated between the fixed contact 22 a and the movable contact 86 b toward the upper surface of the base 10.
The second permanent magnet 32 is disposed so as to emit a magnetic field line that can induce an arc generated between the fixed contact 23 a and the movable contact 87 a in a direction opposite to the upper surface of the base 10.

  In addition, the electromagnetic relay which concerns on this embodiment is 4 poles. However, in the present embodiment, arcs generated between the fixed contact 22a and the movable contact 86b facing each other and between the fixed contact 23a and the movable contact 87a facing each other are generated in a predetermined direction by three permanent magnets. Can be attracted to. For this reason, there is an advantage that the number of parts is smaller than that of the conventional example.

  In the present embodiment, as shown in FIG. 6B, a configuration has been described in which the generated arc is attracted so as to be directed obliquely upward in the direction opposite to the movable contact 86a and the movable contact 87b when viewed from the fixed contacts 21a and 24a. . However, the present invention is not limited to this, and the positions of the fixed contact 21a and the movable contact 86a or the positions of the fixed contact 24a and the movable contact 87b may be interchanged. In this case, when the fixed contact terminals 22 and 23 are made conductive, they correspond to the direction of the current flowing between the fixed contacts 21a, 22a, 23a and 24a and the movable contacts 86a, 86b, 87a and 87b, The directions of the magnetic poles of the first permanent magnet 30 and the second permanent magnet 32 can be determined as appropriate. Thereby, the generated arc can be attracted so as to go obliquely upward in the direction opposite to the fixed contacts 22a and 23a when viewed from the movable contact 86a and the movable contact 87b.

  In the present embodiment, the first permanent magnet 30 having a large magnetic force and the second permanent magnet 32 having a small magnetic force are combined. That is, the magnetic force of the first permanent magnet 30 is larger than the magnetic force of the second permanent magnet 32. As a result, the generation of an arc between the fixed contacts 22a and 23a and the movable contacts 86b and 87a is suppressed, and the arc generated between the fixed contacts 21a and 24a and the movable contacts 86a and 87b is suppressed to the arc extinguishing space 19, This is because each of them is attracted to 19 to effectively erase the arc. The second permanent magnet 32 may be provided as necessary.

  Then, the first permanent magnet 30 and the auxiliary yoke 31 are inserted into the notch groove 17 (FIG. 10B) provided in the base 10. Accordingly, the auxiliary yoke 31 is positioned so as to be adjacent to the first permanent magnet 30. The second permanent magnet 32 is housed in the recess 18 provided in the base 10.

According to the present embodiment, the first and second permanent magnets 30 and 32 and the auxiliary yoke 31 are assembled from the lower surface of the base 10. For this reason, deterioration of the first and second permanent magnets 30 and 32 and the auxiliary yoke 31 due to the generated arc can be prevented. Further, since the thickness dimension of the base 10 can be effectively used, a space-saving electromagnetic relay can be obtained.
The first permanent magnet 30, the auxiliary yoke 31, and the second permanent magnet 32 are not necessarily assembled from the lower surface of the base 10, and may be assembled from the upper surface of the base 10 as necessary.
Further, permanent magnets, or permanent magnets and auxiliary yokes may be arranged behind the fixed contacts 21a to 24a.

  The auxiliary yoke 31 described above is not limited to a rectangular plate-shaped magnetic material, and may be, for example, a substantially L-shaped front surface (FIGS. 11A and 11B). According to this modification, the direction of the lines of magnetic force of the first permanent magnet 30 can be changed to a direction different from the case where a square plate-shaped magnetic material is used. For this reason, by appropriately adjusting the shape and position of the auxiliary yoke 31, it is possible to change the attracting direction of the arc to a desired direction.

  Further, the above-mentioned auxiliary yoke 31 may be a rectangular plate-shaped magnetic material whose corners are chamfered (FIGS. 11C and 11D). According to this modification, since the corners are chamfered, there is an advantage that it is easy to insert into the notch groove 17 and the assembling property is improved.

In the arc extinguishing space 19, for example, an arc interruption member 100 as shown in FIGS. 12A and 12B may be arranged. This is because the generated arc is quenched and erased efficiently.
The arc interrupting member 100 is formed by bending a strip-shaped metal plate into a substantially J-shaped cross section. The arc interrupting member 100 has a plurality of protruding protrusions 101 having a substantially triangular cross section protruding from the front thereof. The protruding protrusion 101 increases the contact area with the arc and enhances the quenching effect. Further, the arc interruption member 100 is bent and raised so that the ribs 102 are opposed to both side edge portions on the front surface thereof. Further, the arc interrupting member 100 is bent up so that the ribs 103 are opposed to both side edges of the bottom surface. The ribs 102 and 103 are for preventing the generated arc from leaking out of the arc extinguishing space 19.

  For example, as shown in FIGS. 12C and 12D, a plurality of tongue pieces 104 may be cut and raised on the front surface of the other arc interrupting member 100. The other parts are the same as those of the arc interrupting member 100 described above. The arc blocking member may be made of metal and is not limited to a metal plate.

As shown in FIGS. 3 and 4, the electromagnet block 40 is formed of a spool 41, a coil 51, an iron core 52, and a yoke 55.
The spool 41 is provided with a through-hole 45 having a square cross section in a body portion 44 having flange portions 42 and 43 at both ends, and an insulating rib 46 projecting laterally on the outward surface of one flange portion 42. Further, the spool 41 is engaged with the engagement holes 47 provided at both side edges of the other flange portion 43 to prevent the relay clips 50 from coming off (FIG. 7B).

  As shown in FIG. 3, the coil 51 is wound around the body portion 44 and soldered with a lead wire tangled to a binding portion 50 a (FIG. 6A) extending from the relay clip 50. .

  As shown in FIG. 3, the iron core 52 is formed by laminating a plurality of planar substantially T-shaped plate-like magnetic materials. Then, the iron core 52 is inserted into the through hole 45 of the spool 41, and the projecting one end thereof is used as a magnetic pole portion 53, while the projecting other end portion 54 is formed by a yoke 55 having a substantially L-shaped cross section described later. The vertical portion 57 is fixed by caulking.

  The yoke 55 is made of a magnetic plate bent in a substantially L-shaped cross section. The yoke 55 has a locking protrusion 56a bent at the center of the horizontal portion 56, and support protrusions 56b cut out at both side edges at the tip of the horizontal portion 56. The yoke 55 has a shape in which a lower end portion 57 a of the vertical portion 57 can be press-fitted into the press-fitting hole 14 of the base 10.

The movable iron piece 60 is made of a plate-like magnetic material. As shown in FIGS. 3 and 4, the movable iron piece 60 has a locking projection 61 projecting from the upper edge portion thereof, and notches 62 and 62 provided at both side edge portions thereof.
In the movable iron piece 60, the notch 62 is engaged with the support protrusion 56 b of the yoke 55. Further, the movable iron piece 60 is rotatably supported by connecting the locking projection 61 to the locking projection 56 a of the yoke 55 via a return spring 63.

The movable contact pieces 80 and 81 are substantially T-shaped in front, and movable contacts 86a, 86b, 87a and 87b are fixed to both ends of the wide portions 82 and 83 via conductive backing materials 84 and 85, respectively. . The backing materials 84 and 85 substantially increase the cross-sectional area of the wide portions 82 and 83, thereby reducing electrical resistance and suppressing heat generation. Further, as described above, the arc is attracted so as to be directed obliquely upward in the direction opposite to the movable contact 86a and the movable contact 87b when viewed from the fixed contacts 21a and 24a. For this reason, it becomes difficult for the generated arc to contact the movable contact pieces 80 and 81 themselves, and the deterioration of the movable contact pieces 80 and 81 due to the arc can be prevented.
The movable contact pieces 80 and 81 have their upper ends integrated with the movable table 74 by insert molding. 7B, the movable table 74 is integrated with the spacer 70 and the movable iron piece 60 through a rivet 64. As shown in FIG. 4, the spacer 70 enhances insulation by fitting the movable iron piece 60 into a recess 71 provided on its inward surface. The spacer 70 has insulating ribs 72 (FIGS. 3 and 7B) on the lower edge of the inward surface, and partitions the movable contact pieces 80 and 81 on the lower edge of the outward surface. Insulating ribs 73 (FIGS. 3 and 7B) project from the side.

  Then, the electromagnet block 40 to which the movable contact pieces 80 and 81 are attached is housed in the base 10, and the collar portion 42 of the spool 41 is placed on the step portion 13 (FIG. 7B) of the base 10. Next, the lower end portion 57a of the yoke 55 is press-fitted into the press-fitting hole 14 of the base 10 and positioned. Thereby, the relay clip 50 of the electromagnet block 40 clamps the connection part 25a of the coil terminal 25 (FIG. 7A). In addition, the movable contacts 86a, 86b, 87a, 87b respectively face the fixed contacts 21a, 22a, 23a, 24a so as to be able to contact and separate. As shown in FIG. 8B, the insulating rib 72 of the spacer 70 is positioned in the vicinity of the upper side of the insulating rib 46 of the spool 41.

Specifically, at least one of the insulating ribs 46 and 72 is disposed so as to block a straight line connecting the fixed contacts 22a and 23a (or the fixed contact terminals 22 and 23) and the magnetic pole portion 53 with the shortest distance. The Thereby, the spatial distance from the magnetic pole part 53 of the iron core 52 to the fixed contacts 22a and 23a becomes long, and high insulation is obtained.
Further, the insulating rib 72 may be disposed so as to block a straight line connecting the tip edge portion of the insulating rib 46 and the magnetic pole portion 53 with the shortest distance. Thereby, the spatial distance from the magnetic pole part 53 of the iron core 52 to the fixed contacts 22a and 23a can be lengthened, and much higher insulation characteristics can be obtained.

  The length dimension of the insulating rib 46 protruding from the outward surface of the flange portion 42 is preferably shorter than the distance from the outward surface of the flange portion 42 to the tips of the fixed contacts 22a and 23a. This is because if the length of the insulating rib 46 is longer than the distance from the outward surface of the flange 42 to the tips of the fixed contacts 22a and 23a, the operation of the movable contact pieces 80 and 81 is hindered. Because there is a fear. Another reason is that arcs generated between the fixed contacts 22a and 23a and the movable contacts 86b and 87a easily hit the insulating rib 72, and the insulating rib 72 is likely to deteriorate. . Therefore, a more preferable length dimension of the insulating rib 46 is a length dimension from the outward surface of the flange portion 42 to the outward surface of the fixed contact terminals 22 and 23.

As shown in FIGS. 3 and 4, the cover 90 has a box shape that can be fitted to the base 10 to which the electromagnet block 40 is assembled. The cover 90 is provided with a pair of vent holes 91, 91 on the ceiling surface. The cover 90 is provided with an engagement receiving portion 92 that engages with the engagement claw portion 10a of the base 10 on the inner surface facing the cover 90, and a position restriction rib 93 (FIG. 5B) is provided on the inner surface of the ceiling. It is.
For this reason, when the cover 90 is fitted to the base 10 to which the electromagnet block 40 is assembled, the engagement receiving portion 92 of the cover 90 is engaged with and fixed to the engagement claw portion 10a of the base 10. The position restricting rib 93 abuts against the horizontal portion 56 of the yoke 55 to restrict the lifting of the electromagnet block 40 (FIG. 5B). Further, a sealing material (not shown) is injected into the lower surface of the base 10, solidified and sealed, thereby completing the assembly operation.
In the present embodiment, by injecting the sealing material, the gap between the base 10 and the cover 90 is sealed, and at the same time, the first and second permanent magnets 30 and 32 and the auxiliary yoke 31 can be fixed to the base 10. For this reason, according to this embodiment, an electromagnetic relay with few work steps and high productivity can be obtained.

Next, the operation of the above-described embodiment will be described.
When the electromagnet block 40 is not excited, the movable iron piece 60 is urged clockwise by the spring force of the return spring 63 as shown in FIGS. Therefore, the movable contacts 86a, 86b, 87a, 87b are separated from the fixed contacts 21a, 22a, 23a, 24a, respectively.

  When a voltage is applied to the coil 51 for excitation, the movable iron piece 60 is attracted to the magnetic pole portion 53 of the iron core 52, and the movable iron piece 60 rotates counterclockwise against the spring force of the return spring 63. Move. For this reason, after the movable contact pieces 80 and 81 rotate integrally with the movable iron piece 60 and the movable contacts 86a, 86b, 87a and 87b come into contact with the fixed contacts 21a, 22a, 23a and 24a, respectively, the movable iron piece 60 is moved. It attracts | sucks to the magnetic pole part 53 of the iron core 52 (FIG. 9).

  Next, when the application of voltage to the coil 51 is stopped, the movable iron piece 60 is rotated clockwise by the spring force of the return spring 63, and the movable iron piece 60 is separated from the magnetic pole portion 53 of the iron core 52. The movable contacts 86a, 86b, 87a, 87b are separated from the fixed contacts 21a, 22a, 23a, 24a, respectively, and return to the original state.

  According to the present embodiment, as shown in FIGS. 6 and 7, even if the arc 110 is generated when the movable contacts 86a and 87b are separated from the fixed contacts 21a and 24a, the magnetic lines of force of the first permanent magnet 30 are assisted. It acts on the arc 110 via the yoke 31. For this reason, based on Fleming's left-hand rule, the generated arc 110 is attracted to the arc extinguishing space 19 of the base 10 by Lorentz force, and is stretched and disappears.

  Further, according to the present embodiment, the arc 110 can be attracted and erased obliquely behind the fixed contacts 21a and 24a only by the first permanent magnet 30. Here, the diagonally rear of the fixed contacts 21a, 24a means a direction opposite to the movable contacts 86a, 87b facing each other when viewed from the fixed contacts 21a, 24a and a direction opposite to the base.

Furthermore, by arranging the auxiliary yoke 31, the arc 110 can be attracted in the left-right direction, and the attraction direction can be adjusted. Here, the left-right direction of the arc 110 refers to a direction perpendicular to the direction in which the fixed contacts 21a, 24a and the movable contacts 86a, 87b face each other and parallel to the upper surface of the base.
Therefore, according to the present embodiment, the generated arc 110 is stretched in an appropriate obliquely rearward direction without contacting the inner surface of the cover 90 or the electromagnet block 40. For this reason, the arc 110 can be erased more efficiently.

  And according to this embodiment, since the dead space located behind the fixed contacts 21a and 24a is effectively used as the arc extinguishing space 19, there is an advantage that the enlargement of the apparatus can be avoided.

  Of course, the shape, size, material, arrangement, and the like of the first and second permanent magnets 30 and 32 and the auxiliary yoke 31 are not limited to those described above, and can be changed as necessary.

The first embodiment analyzes the direction and strength of the magnetic field lines when the first and second permanent magnets 30 and 32 and the auxiliary yoke 31 are combined.
As an analysis result, the direction of the magnetic lines of force is illustrated by vector lines (FIG. 14), and the strength of the magnetic lines of force is illustrated by shading (FIG. 15).

In the second embodiment, except that the auxiliary yoke 31 is not provided, the other is the analysis of the direction and strength of the lines of magnetic force when arranged in the same manner as in the first embodiment.
As an analysis result, the direction of the magnetic lines of force is illustrated by vector lines (FIG. 16), and the strength of the magnetic lines of force is illustrated by shading (FIG. 17).

14 and 15, how and how much the magnetic lines of force of the first and second permanent magnets 30 and 32 act between the fixed contacts 21a to 24a and the movable contacts 86a, 86b, 87a and 87b. I was able to confirm.
Further, by comparing FIGS. 14 and 15 with FIGS. 16 and 17, it can be confirmed that when the auxiliary yoke 31 is provided, the direction of the magnetic force lines of the permanent magnet and the distribution of the strength of the magnetic force lines change.

The present invention is not limited to a DC electromagnetic relay but may be applied to an AC electromagnetic relay.
Moreover, although the said embodiment demonstrated the case where it applied to a 4 pole electromagnetic relay, you may apply not only to this but to an at least 1 pole electromagnetic relay.
Moreover, you may apply this invention not only to an electromagnetic relay but to a switch.

DESCRIPTION OF SYMBOLS 10 Base 10a Engagement nail | claw part 11 Recess 12 Partition wall 13 Step part 14 Press-fit hole 15a, 15b, 15c, 15d Terminal hole 16a, 16b Terminal hole 17 Notch groove 18 Recessed part 19 Arc erasing space 21-24 Fixed contact terminal 21a -24a Fixed contact 25 Coil terminal 25a Connection part 25b Terminal part 30 1st permanent magnet 31 Auxiliary yoke 32 2nd permanent magnet 35 Magnetic field generating means 40 Electromagnet block 41 Spool 42, 43 collar part 44 Body part 45 Through hole 46 Insulating rib 47 engaging hole 50 relay clip 51 coil 52 iron core 53 magnetic pole part 55 yoke 60 movable iron piece 70 spacer 71 recess 72 insulating rib 73 insulating rib 74 movable base 80 movable contact piece 81 movable contact piece 82 wide part 83 wide Part 84 Backing material 85 Backing material 86a, 86b Movable contact 7a, 87b movable contact 90 cover 91 venting hole 92 engagement receivers 93 position regulating ribs 100 arc interruption member 101 protrudes protrusion 102 rib 103 rib 104 tongue 110 arc

Claims (5)

Base and
An electromagnet block installed on the upper surface of the base;
A movable iron piece that rotates based on excitation / de-excitation of the electromagnet block;
A movable contact piece that rotates integrally with the movable iron piece;
A movable contact fixed to the free end of the movable contact piece;
A fixed contact disposed so as to be in contact with and away from the movable contact with the rotation of the movable contact piece;
An arc generated between the movable contact and the fixed contact is in a direction opposite to the movable contact or the fixed contact facing the fixed contact or the movable contact and in a direction opposite to the base. Magnetic field generating means arranged to attract and
With
An electromagnetic relay characterized in that an arc extinguishing space located in a direction opposite to the movable contact or the fixed contact facing the fixed contact or the movable contact is disposed on the upper surface of the base .   2. The movable contact piece has a substantially T-shape having a wide portion at a tip, and the movable contact is fixed to a free end portion of the wide portion. Electromagnetic relay.   The magnetic field generating means includes a permanent magnet and an auxiliary yoke, wherein the permanent magnet is disposed in a direction in which the fixed contact and the movable contact are in contact with or separated from each other, and the auxiliary yoke is adjacent to the permanent magnet. The electromagnetic relay according to claim 1 or 2. Claims 1, characterized in that the partition wall provided on the upper surface of the base, and the fixed contact terminal disposed the fixed contacts forming said arc quenching space between the terminal holes for placement in the base The electromagnetic relay as described in any one of 3 . The electromagnetic relay according to any one of claims 1 to 4, wherein a metal arc interrupting member is disposed in the arc extinguishing space.

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